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| All Patents in class 418/39 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,988,213 | Jan. 15, 1935 | P.O. Ott | Multiple Rotary Pump | rotary pumps | |
| 2,492,687 | Dec. 27, 1949 | A.H. Dall | Hydraulic Pump | hydraulic apparatus | |